ARGO实验探测γ暴的灵敏度研究

1、31 12007 1 HIGHENERGYPHYSICSANDNUCLEARPHYSICSVol.31,No.1Jan.,2007SensitivityStudyofGamma-RayBurstDetectionbyARGO*ZHOUXun-Xiu1;1)CHENGNing2HUHong-Bo2HUANGQing11(ScienceCollegeofSouthwestJiaotongUniversity,Chengdu610031,China)2(InstituteofHighEnergyPhysics,CAS,Beijing100049,China)AbstractARGOisa“fullc

2、overage”airshowerdetectorcurrentlyunderconstructioninTibet,China.Oneofthemaingoalsofthisexperimentistosearchforpossiblegamma-raybursts(GRBs)withE10GeV.Inthiswork,thesensitivityinobservingaGRB(withacertainsignicance)byARGOisfoundtobedependentontheuxoftheGRB,theslopeandtheenergycutoofitsspectrum,aswel

3、lasitstimedurationandthezenithangleattheobservation.KeywordsYBJ-ARGOexperiment,GRBs,sensitivity1IntroductionGRB,aviolentenergyreleaseatunpredictabledicttheexistenceofhigherenergyGRBs.How-ever,mostup-to-dateknownGRBswereobservedinenergyrangebetweenseveralkeVandseveralMeVandtheonlyexceptionisfromEGRET

4、onaboardtheCGROwhichhasdetectedGeVphotonsinco-incidencewith3BATSEGRBs.Inordertounder-standthecompletepictureoftheprocess,itisimpor-tanttoimprovethesamplestatisticsofhighenergyGRBsandtomeasuretheirmulti-bandwidthenergyspectrum.Theground-basedAS(airshower)exper-imentspossessmanyadvantagessuchaswideeld

5、ofviewandhighdutycycle,therefore,areespeciallysuitableforGRBdetection.ComparedwithmanyexistingASarrays,ARGOhastwoadditionaladvan-tages:highaltitudeandfullcoverage,withwhichthethresholdenergyofARGOissignicantlydecreasedandARGOisexpectedtohavehighersensitivityindetectingGRBsthanotherASarrays.Inthiswor

6、k,westudytheARGOsensitivityindetectingGRBswithphotonenergiesgreaterthan10GeVforthecasesofdierentpowerlawindexesandcutoenergies,aswellasthezenithanglesofGRBsintheARGOseldofview.3timeandfromunpredictableskydirection,thoughhavinghadmorethan30yearshistorysinceitsrstdiscovery,isstilloneofthemostmysteriou

7、sastronomicalphenomena.ThesatelliteexperimentBATSEonaboardtheCGROlaunchedin1991hasfoundthousandsofGRBs,aboutoneperdayonav-erage.TheirresultsshowedthatthearrivaldirectionofGRBsishighlyisotropicanditsupportsGRBsoriginatcosmologicaldistance.Furthermore,theaccuratelocationofGRBswithX-rayafterglowob-serv

8、ationbyBeppoSAXsatellitemanifestedthatatleastpartofGRBswasindeedoriginatedfromcosmo-logicaldistance.Now,severalsatelliteexperimentssuchasHETE,INTEGRALandSwiftaresearchingforGRBswithenergiesfromkeVtoMeV.Atthesametime,theoreticalstudiesaregoingonveryac-tively.Thoughmuchprogresshasbeenachievedfrombothe

9、xperimentalandtheoreticaleorts,lotsofbasicquestionssuchastheemissionmechanismofGRBsstillremainunresolved.Sometheoreticalmodelspre-2166 (HEP&NP) 312003.ps万方数据NAscos.(1)1 ARGO 67Emax.(2)EdE10GeVHere,Ae(E)istheparameterizedfunctionaccordingtothepointsinFig.2,andforEmax,valuesbetween50and1000GeVareconsi

10、dered.4Minimumsignaleventraterequiredfora5sigmaobservationInARGOexperiment,aGRBappearstobeashowerclusterinagivensmallskywindowandatimeinterval(t)withanappropriatesignicance.Inthiswork5wastakenasthenecessarysigni-cancetospecifyaGRBfromthebackgrounductu-681 ARGO 69References1MeeganCAetal.Nature,1992,3

11、55:1431452MetzgerMRetal.Nature,1997,387:8788803MAXin-Huaetal.HEP&NP,2003,27(11):973977(inChinese)9CUIShu-Wangetal.HEP&NP,2005,29(1):6267(inChinese)( . ,2005,29(1):6267)10CHENXinetal.HEP&NP,2004,28(10):10941098(inChinese)( . ,2004,28(10):10941098)11HurleyKetal.Nature,1994,372:652661ARGO *1;1)22100049

12、)11( 610031)2(ARGO “ ” , E10GeV . MonteCarlo , ARGO 10GeV .YBJ-ARGO ARGO实验探测暴的灵敏度研究作者：作者单位：刊名：英文刊名：年，卷(期)：周勋秀， 程宁， 胡红波， 黄庆， ZHOU Xun-Xiu， CHENG Ning， HU Hong-Bo， HUANG Qing周勋秀,黄庆,ZHOU Xun-Xiu,HUANG Qing(西南交通大学理学院,成都,610031)， 程宁,胡红波,CHENG Ning,HUHong-Bo(中国科学院高能物理研究所,北京,100049)高能物理与核物理HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS2007,31(1)1.崔树旺 羊八井ARGO实验对Crab源灵敏度的研究期刊论文-高能物理与核物理 2005(01)2.查看详情 19963.查看详情4.查看详情5.查看详情6.查看详情7.Hurley K 查看详情 19948.陈欣 TeV 暴搜寻中最优窗口角半径的探讨期刊论文-高能物理与核物理 2004(10)9.Dingus